THQ's surprising experiment into the pay-what-you-want Humble Bundle initiative has sweetened the deal even further, adding the acclaimed 2006 action RPG Titan Quest, and Red Faction: Armageddon's Path to War content expansion to the pot.

Those that had already purchased the bundle can nab new Steam keys for both titles from humblebundle.com, while newcomers need only to pay a price higher than the current average, which is still under US$6 to nab Titan Quest in addition to Saints Row: The Third, Darksiders, Company of Heroes, Company of Heroes: Opposing Fronts, Company of Heroes: Tales of Valor, Metro 2033, Red Faction: Armageddon, and Red Faction's DLC.

The bundle has now impressively sold over 670,000 units, with total payments exceeding $3.7M.